I have heard speculation that the vast undersea frozen methane ice fields could be mined with robots. As the methane ice was removed, it would be allowed to warm, then the gas ignited to provide energy. Some of this energy would be used to create dry ice, that would serve several purposes.
To start with, it would replace much of the volume of the methane ice, to help prevent tunnel collapse. And being very cold, it would reduce the temperature of the methane ice to prevent explosion. And the CO2 would go further when sublimated, by preventing accidental fire because of sparks.
As it sublimated, it would be replaced with ordinary water ice.
As an aside, just within the past few days, it was learned that the mid-Atlantic ocean doesn’t just absorb vast amounts of atmospheric CO2, but also absorbs vast amounts of atmospheric ozone and methane. This is a new discovery, and has very important implications in the MMGW models.
Man Made Global Warming would be much better served by putting up the moneys for the kind of ideas that we are talking about than by the many funding hoaxes which 'environmentalism' has generated.
Better yet; let's move manufacturing to the moon and mars.
Methane Bubbling From Arctic Lakes
Nature 442, 793-796 (17 August 2006) | doi:10.1038/nature04945; Received 4 April 2006; Accepted CO2 jets formed by sublimation beneath translucent slab ice in Mars' seasonal south polar ice cap